Montignac, also called Montignac sur Vézère or Montignac-Lascaux, is a commune in the Dordogne department in Aquitaine in southwestern France. It is a small town situated on the Vézère river and has been the capital of the canton of Montignac since 1790. In 2015 it became the capital of the newly created Canton de la Vallée de l'Homme.

Montignac is a commune and small town in the department of Dordogne. It is situated in the historic region of Périgord noir, just below the confluence of the River Vézère and the Laurence, a small river which rises near the town of Thenon.

Montignac is situated at a strategic site with a fine bridge over the Vézère and from the eleventh to the fourteenth century was one of the seats of the Counts of Périgord. Their Château de Montignac now lies in ruins, though some wall bases, terraces and a single tower remain.

Montignac was the home of the nineteenth-century French writer Eugène Le Roy, who was a district tax collector and wrote two celebrated novels about rural life in eighteenth-century Périgord. There is a small museum in the town dedicated to him.

Montignac is the main centre for visiting the prehistoric sites in the Vézère valley. The modern part of the town to the south of the river has several hotels and the tourist office. To the north of the river lies the old town, where there are a maze of streets with fourteenth- to sixteenth-century timbered houses. A market is held here twice weekly and there are restaurants where visitors can sit beside the river under medieval timbered beams.

Montignac has a historic bridge, from which fireworks are launched on holidays such as Bastille Day and during the summer festival of world folklore and dance, which is held annually in July.

The main attraction of the region is the Lascaux Cave, actually a complex of caves containing Upper Paleolithic painted art discovered in 1940 and estimated to be 17,300 years old. The cave was put on show in 1948, but it was found that the paintings were being damaged by the carbon dioxide exhaled by visitors, and in 1963, the cave was closed to the public. A replica cave, known as Lascaux II, was opened nearby in 1983, so that visitors could still experience the paintings without damaging the originals.

In 1979, Lascaux was added to the UNESCO World Heritage Sites list along with other prehistoric sites in the Vézère valley.